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Chapter 3: How to Certify Fiber Cabling
Requirements for Reliable Fiber Test Results
47
About Standard Mandrels
Standard mandrels make measurements of multimode power loss
more reliable than if you use no mandrels, but the measurements
do not comply with the standards for encircled flux. Fluke
Networks recommends that you always use only the EF-TRCs with
the CertiFiber Pro multimode modules so that your measurements
comply with EF standards.
If you must do tests in Far End Source mode with a different
multimode source, and the source is not approved by Fluke
Networks for use with the TRCs, use standard mandrels. Make
sure you use the size of mandrel that is correct for 50 µm or
62.5 µm fiber, and read all instructions for the source and
mandrel.

Caution
If you use mandrels for tests on multimode fiber,
do not use test reference cords made from bend-
insensitive fiber. The mandrels possibly will not
remove all of the modes that can make your loss
measurements unreliable.